44 lines
1.3 KiB
Julia
44 lines
1.3 KiB
Julia
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include("utils.jl")
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function parse_input(filename)
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map(x->parse.(Int, x), split.(non_empty_lines(filename), ""))
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end
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function flash(octopuses)
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sum(map(CartesianIndices((2:11, 2:11))) do coord
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if octopuses[coord] > 9
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octopuses[coord] = -8
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for neighbor in CartesianIndices((coord[1]-1:coord[1]+1, coord[2]-1:coord[2]+1))
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octopuses[neighbor] += 1
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end
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1
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else
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0
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end
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end)
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end
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function solution11_1()
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octopuses = transpose(reshape(reduce(vcat, [[fill(-2000000, 12)]; map(x -> [-2000000; x; -2000000], parse_input("11.data")); [fill(-2000000, 12)]]),(12,12)))
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sum(map(1:100) do _
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map!(x->x+1, octopuses, octopuses)
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flashes = sum(collect(Iterators.takewhile(>(0), (flash(octopuses) for _ in 1:100))))
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clamp!(octopuses, 0, 9)
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flashes
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end)
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end
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function solution11_2()
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octopuses = transpose(reshape(reduce(vcat, [[fill(-2000000, 12)]; map(x -> [-2000000; x; -2000000], parse_input("11_ex.data")); [fill(-2000000, 12)]]),(12,12)))
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for i in 1:1000
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map!(x->x+1, octopuses, octopuses)
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flashes = sum(collect(Iterators.takewhile(>(0), (flash(octopuses) for _ in 1:100))))
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if flashes == 100
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return i
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end
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clamp!(octopuses, 0, 9)
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end
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end
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solution11_2()
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